ELECTROPRODUCTION OF PI+N,PI-P AND K+LAMBDA, K+SIGMA-0 FINAL-STATES ABOVE THE RESONANCE REGION

The reactions Σvp→π+n, K+Λ, K+∑0 and Σvn→π+n were studied at invariant hadronic masses around 2.2. GeV for Q2=0.06, 0.28, 0.70, and 1.35 GeV2. The main results are: At small |t| the π+ production is dominated by longitudinally polarized photons and can be described by one pion exchange. At low |t| the transverse (π+n) cross section drops steeply with Q2, but remains roughly constant for Q2≧0.5 GeV2. For |t⊢≧0.8 GeV2, (π+n/dt) is almost independent of Q2. The integrated cross section (π+n) shows a similar Q2-dependence as σtot (γvp) for Q2≧0.28 GeV2. The ratio σ(π-p)/σ(π+n) at Q2=0.70 and 1.35 GeV2 for |t|≧0.6 GeV2 is smaller than in photoproduction and close to 1/4. The ratio σ(K+∑0 decreases steeply with Q2 following roughly the predictions of the quark-parton model. © 1979 Springer-Verlag.